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Expand the LLVM coverage of --print target-cpus #111274

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May 7, 2023
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Expand the LLVM coverage of --print target-cpus #111274

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30 changes: 16 additions & 14 deletions compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -297,7 +297,6 @@ static Reloc::Model fromRust(LLVMRustRelocModel RustReloc) {
report_fatal_error("Bad RelocModel.");
}

#ifdef LLVM_RUSTLLVM
/// getLongestEntryLength - Return the length of the longest entry in the table.
template<typename KV>
static size_t getLongestEntryLength(ArrayRef<KV> Table) {
Expand All @@ -312,13 +311,23 @@ extern "C" void LLVMRustPrintTargetCPUs(LLVMTargetMachineRef TM, const char* Tar
const MCSubtargetInfo *MCInfo = Target->getMCSubtargetInfo();
const Triple::ArchType HostArch = Triple(sys::getDefaultTargetTriple()).getArch();
const Triple::ArchType TargetArch = Target->getTargetTriple().getArch();

#if LLVM_VERSION_GE(17, 0)
const ArrayRef<SubtargetSubTypeKV> CPUTable = MCInfo->getAllProcessorDescriptions();
#elif defined(LLVM_RUSTLLVM)
const ArrayRef<SubtargetSubTypeKV> CPUTable = MCInfo->getCPUTable();
#else
printf("Full target CPU help is not supported by this LLVM version.\n\n");
SubtargetSubTypeKV TargetCPUKV = { TargetCPU, {{}}, {{}} };
const ArrayRef<SubtargetSubTypeKV> CPUTable = TargetCPUKV;
#endif
unsigned MaxCPULen = getLongestEntryLength(CPUTable);

printf("Available CPUs for this target:\n");
// Don't print the "native" entry when the user specifies --target with a
// different arch since that could be wrong or misleading.
if (HostArch == TargetArch) {
MaxCPULen = std::max(MaxCPULen, (unsigned) std::strlen("native"));
const StringRef HostCPU = sys::getHostCPUName();
printf(" %-*s - Select the CPU of the current host (currently %.*s).\n",
MaxCPULen, "native", (int)HostCPU.size(), HostCPU.data());
Expand All @@ -338,34 +347,27 @@ extern "C" void LLVMRustPrintTargetCPUs(LLVMTargetMachineRef TM, const char* Tar
}

extern "C" size_t LLVMRustGetTargetFeaturesCount(LLVMTargetMachineRef TM) {
#ifdef LLVM_RUSTLLVM
const TargetMachine *Target = unwrap(TM);
const MCSubtargetInfo *MCInfo = Target->getMCSubtargetInfo();
const ArrayRef<SubtargetFeatureKV> FeatTable = MCInfo->getFeatureTable();
return FeatTable.size();
#else
return 0;
#endif
}

extern "C" void LLVMRustGetTargetFeature(LLVMTargetMachineRef TM, size_t Index,
const char** Feature, const char** Desc) {
#ifdef LLVM_RUSTLLVM
const TargetMachine *Target = unwrap(TM);
const MCSubtargetInfo *MCInfo = Target->getMCSubtargetInfo();
const ArrayRef<SubtargetFeatureKV> FeatTable = MCInfo->getFeatureTable();
const SubtargetFeatureKV Feat = FeatTable[Index];
*Feature = Feat.Key;
*Desc = Feat.Desc;
}

#else

extern "C" void LLVMRustPrintTargetCPUs(LLVMTargetMachineRef) {
printf("Target CPU help is not supported by this LLVM version.\n\n");
}

extern "C" size_t LLVMRustGetTargetFeaturesCount(LLVMTargetMachineRef) {
return 0;
}

extern "C" void LLVMRustGetTargetFeature(LLVMTargetMachineRef, const char**, const char**) {}
#endif
}

extern "C" const char* LLVMRustGetHostCPUName(size_t *len) {
StringRef Name = sys::getHostCPUName();
Expand Down